In this work, we summarize a series of flume experiments to evaluate the effect that low-permeability layers, representative of structural heterogeneity, have on hyporheic exchange and oxygen consumption in sandy streambeds.
At the reach and bedform scales, modeling studies have shown that sediment heterogeneity significantly modifies hyporheic flow patterns within bedforms, resulting in spatially heterogeneous biogeochemical processes. Improve our ability to model the effect of stream-groundwaterĪbstract = "Recent studies at the watershed scale have demonstrated the dominant role that river bedforms play in driving hyporheic exchange and constraining biogeochemical processes along river corridors. Streambed and oxygen consumption along bed forms and are expected to The coupling between flow conditions, local heterogeneity within the Our preliminary results enable us to show the importance of Reactions rates under the different flow conditions and spatial sediment The results with a numerical flow and transport model to quantify the Of 1-3 cm below the water-sediment interface. Thus was less influenced by the clay layers that were located at a depth The aerobic zone was limited to the upper sections of the bedform and Streambed under neutral and losing conditions. Significant effect on flow patterns and oxygen distribution in the The experimental observations revealed that the clay layer had a Oxygen distribution in the streambed was measured using planar optodes. Represented by continuous and discontinuous layers of clay material.įlow patterns were studied using dye imaging through the side walls. Theįlume was packed with natural sediments, which were amended with compost Of the heterogeneities, the surface channel flow driving the exchange,Īnd groundwater fluxes (gaining/losing) modulating the exchange. In this case, we systematically changed the geometry Heterogeneity, have on hyporheic exchange and oxygen consumption in In this work, we summarize a series of flume experiments to evaluate theĮffect that low-permeability layers, representative of structural Heterogeneity significantly modifies hyporheic flow patterns withinīedforms, resulting in spatially heterogeneous biogeochemical processes. Reach and bedform scales, modeling studies have shown that sediment
Role that river bedforms play in driving hyporheic exchange andĬonstraining biogeochemical processes along river corridors.
Recent studies at the watershed scale have demonstrated the dominant
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